P. Temnikov

TL;DR: Very high energy (VHE) gamma-ray emission from the flat spectrum radio quasar (FSRQ) PKS 1222+21 (4C 21.432) was detected with the MAGIC Cherenkov telescopes during a short observation (~0.5 hr) performed on 2010 June 17.

TL;DR: By developing a new electronic trigger, the threshold of the MAGIC telescope is lowered, revealing a relatively high cutoff energy in the phase-averaged spectrum, which indicates that the emission occurs far out in the magnetosphere, hence excluding the polar-cap scenario as a possible explanation of the measurement.

TL;DR: The MAGIC telescopes as mentioned in this paper are two Imaging Atmospheric Cherenkov Telescopes (IACTs) located on the Canary island of La Palma, Spain, which are designed to measure Cherennikov light from air showers initiated by gamma rays in the energy regime from around 50GeV to more than 50TeV.

TL;DR: In this article, the teraelectronvolt emission from the γ-ray burst GRB 190114C was observed in the energy range 0.2 − 1 teralectron volt from about one minute after the burst (at more than 50 standard deviations in the first 20 minutes), revealing a distinct emission component with power comparable to that of the synchrotron component.

TL;DR: The long-term multi-wavelength light curve of M 87, spanning from radio to VHE and including data from Hubble Space Telescope, Liverpool Telescope, Very Large Array, and European VLBI Network, is used to further investigate the origin of the VHE gamma-ray emission.